No, they no longer use the keywords meta tag to rank sites in the results pages.

They do use the TITLE tag, meta title tag (two separate entities) & the meta description along with other tags such as the robots meta tag.

Meta tag is the one that stores the meta-data about the HTML file. It contains the characteristics of the characters to be used.

There is no such tag. I doesn't do anything.

html

Meta tags gives detail about the metadata of the HTML.It also about the character set used in HTML.